Holley Terminator X

Holley Inc

About this app

UNLOCK THE NEXT LEVEL OF TUNING CONTROL FOR YOUR VEHICLE with the Holley Terminator X EFI mobile app — the ultimate companion for performance tuning right from your Android device.

Take control of your engine’s performance with 250+ CUSTOMIZABLE PARAMETERS FOR PRECISE TUNING. Designed for enthusiasts and professionals alike, the Holley Terminator X EFI app lets you FINE TUNE ENGINE PARAMETERS FOR MAXIMUM PERFORMANCE — all from the convenience of your mobile device.

Key Features:

· Six pre-defined real-time monitoring screens for instant access to vital engine data

· Intuitive setup wizard helps you easily create a powerful base tune in minutes

· View real-time gauges on screen at a glance – no laptop required

· Effortlessly create, manage, and share your tuning files with others

· Record and share datalogs to review your performance anytime, anywhere

· Simple, step-by-step Throttle Position Sensor (TPS) setup for accurate control

Built specifically for use with Holley’s Terminator X EFI systems, this app gives you advanced tuning capabilities in a streamlined, mobile-friendly interface.

Perfect for racers, tuners, and performance enthusiasts — take your tuning to the next level and keep your engine dialed in with Holley.


App Requires the Holley Bluetooth Module to connect to the Terminator X ECU.

Ratings and reviews

apps pretty good there are some changes to be made and perfected. I really wish I could make adjustments to the tune files when not connected. Most times in the car I have so much going on things are hard to remember be nice to be able to just hop on the app and grab the most recent saved file and make adjustments while I'm thinking about it at the dinner table like a great tuner would lol.

app looks good, time will tell once I actually have the module. PLEASE make this app work with Android Auto! then the dash panel gauges and monitors could be on the infotainment screen without the phone having to even be out.

requires a $200+ Bluetooth module and doesn't support a USB programming cable.

What’s new

New Dash Layouts
Various other minor bug fixes